The weirdest thing is when it happens: Only when I play Red Faction Guerrilla (it over heats in fewer than five minutes, guaranteed) and Darksiders (the time varies from ten minutes to two hours). The problem started after a five to six hour play session after I first got Darksiders.

Before my recent move, I tried making sure it had plenty of air, dusting it out, using new silicone on the CPU, the InterCooler external fans, sacrificing to the Volcano Gods (it was an overheating problem after all).